a simple user model that generates a unique token for a newly signed up user.

user.rb

class User < ApplicationRecord
  has_secure_password
  validates_format_of :email, :with => /\A[^@\s]+@([^@\s]+\.)+[^@\s]+\z/
  
  def generate_email_confirmation_link
    path = ENV["CLIENT_APPLICATION_ROOT"]
    token = CoreModules::JsonWebToken.encode({user_id: self.id}, 30.minutes.from_now)
    return "#{path}/users/confirmations/#{token}?type=#{'email'}"
  end
  
  def verify_email
    if !self.email_verified?
      self.update(email_verified: true)
    else
      return false
    end
  end
end